摘要：

A polarisation beam splitter () comprises a substrate () and a branched waveguide () formed on top of the substrate () and having a main portion () and two branch portions () and () with gradual splitting angles relative to the main portion () for conducting respective polarisation components along respective axes. One of the branch portions () is formed with a dielectric coating () in the region in which the branch portion () splits off from the main portion (). The dielectric coating () serves to stress or de-stress the branch portion () in the region of the branching junction relative to the branch portion (), such that different polarisation components in the main portion () are split apart along respective branch portions () and () by the resulting differential birefringence. Such an arrangement, which may also be applied to a combiner, is advantageous since it provides efficient splitting of polarisation components and is easily fabricated.

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